All car makers recommend against using anything but ATF! Some shops add on a charge for "Valvolene flushing liquid" or similar description of what probably doesn't even get used, but one should not add anything for such "cleaning" purposes other than fresh atf since 1) it won't likely be in the transmission long enough to clean anything, and 2) there is no way to get all of it out even if ten or twelve quarts of new fluid are used. Most likely it will be a simple, automated fluid exchange where hopefully they still check the fluid level properly (never really a given as many have discovered). This was by far the biggest hassle of the entire job.Ĭlick to expand.We first need to know what they will be doing if/when they say "flush". Yes, it can be a hassle correcting for a non-level working surface (ask me how I know!). Same goes for using 0W20 in these cars, where 5W30 is what the engine was actually designed to use under even the coldest temperature conditions. This is not just Toyota doing these things, and it is not in the best interest of your car's service life I can tell you. We all know by now that the car makers specify such thin OEM fluid (and overly-busy shift logic parameters on US-market cars) ONLY because it allows them to achieve slightly higher CAFE ratings so they can sell their more-profitable gas-hogging vehicles without paying "guzzler tax" fees imposed by the US EPA. The thicker viscosity (still meets all WS requirements) better damps the cyclic appliucation of the pulsewidth-modulated TC clutch actuation, preventing shudder at it's source. In lieu of using additives as a first-round shudder cure, better to start by simply performing the overdue replacement of the transmission's near-entire volume of transmission fluid, using a much-thicker WS-rated full-synthetic fluid like Castrol Transmax ATF/CVT Universal (which costs less than half what Toyota fluid costs. Never over-fill the trans by anything like a pint, it's designed to operate with a very-correct level and a pint difference absolutely dwarfs even the full 18-degree range of checking temperature! But I would use the lower half of the temperature range every time when reinstalling the plug. Correct that the temperature difference isn't great between using a pan thermometer and using the built-in sensor with a scanner.
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